One of the sentences in the text on the right is irrelevant to the main idea of the paragraph. Read the following passages and find the irrelevant sentences in each paragraph. For many years, all books were written by hand. Because it took so long to write one book, there were only a few of them. Most people could never own a book. Then sometime between 1450 and 1460, Johannes Gutenberg got the idea of carving separate letters and moving them to make new words. Gutenberg died at the age of 68. This was the invention of moveable type. From then on, the numbers of books printed grew quickly.